NOTES OF PLANTS OF THE NEIGHBOURHOOD OF OXFOKD. 14-5 



*T. pon-ifoliHs, L. By a stream running into the Medina below New- 

 port (P. Strattou) ; bank near East Medina Mill (J. Pristo). I do not 

 know whether it is permanently established. 



SoHchus oleraceus, L., var. lacerus, Willd. Foot of WliiteclifF, and 

 banks by the shore between Luccombe and Bonchurch. 



Taraxacum officinale, Wigg., var. ert/throspennum, Andrz. Sandhills 

 at St. Helen's Spit and chalk downs, frequent. 



T. officinale, var. T. icdum, Jordan. Wet pastures near Bembridgc and 

 St. Helen's. Dr. Bell Salter's specimens from near Eyde belong to this 

 form, and not to the typical T. palustre, which, so far as I know, has not 

 yet been found in the Isle of Wight. 



\_Crepis bieimis, L. Appeared (1868) as a troublesome weed in a field 

 recently laid down in Grass at Alverstone, Whippingham (J. Pristo and 

 F. Strattou).] 



[C. setosu, Hall. Clover fields near Totland's Bay, at Boldner and at 

 Compton (J. G. Baker) ; Headou Hill and Thorley (Dr. G. R. Tate).] 

 {To be continued?) 



NOTES OF PLANTS OF THE NEIGHBOURHOOD OF 

 OXFORD. 



By W. T. Thiselton Dyer, B.A., B.Sc. 



Floras for the counties drained by the upper waters of the Thames are 

 still to be worked out. It would be an interesting contribution towards 

 them to explore thoroughly the country about Oxford, taking both sides 

 of the Thames valley, although distinguishing, of course, for the benefit 

 of future workers in each county, the plants which belong to Oxfordshire 

 and Berkshire. Botanists residing at the University unfortunately go 

 away too soon in the summer and come back too late to do very much, 

 yet even what is to be seen of the local vegetation is well worth liunting 

 up. As little has been published since Walker's ' Flora ' (which is quite 

 out of date), the following notes will probably be useful to some readers 

 of the ' Journal of Botany :' — 



Ranunculus pHeudofiidtans, Newb. ex Bab. — The marshy meadows about 

 Oxford are intersected by numerous anastomosing branches of the Thames. 

 In early summer these are often covered by dense masses of an aquatic 

 Ranunculus, bearing a profusion of large and handsome flowers. It seems 

 to me a state of R.jlonbundus, Bab., without floating leaves, which is all 

 I take R. pseudofluilans to be. 



R. Drouetii, Schultz, a Batrachian, distinguishable from R. Iricho- 

 phyllus, Chaix, by its collapsing leaves, is probably distributed throughout 

 the Thames basin. Near Bablock Hythe Ferry, Berks. 



R. fluitans. Lam. — 1 never detected this species myself, probably from 

 its being a Juue-iiowering plant, and later, therefore, than pseudojluitans, 

 which is at its prime in May. I have what I take to be an example of it 

 from Professor Lawson. Water-plants come to the front or rather sur- 

 face, make their show of flowei's, aud retire in regular succession (see he- 

 low with respect to Potumogeion^. The useful observers who attend to 

 the time of flowering would do really important work if they would fix 

 for us the date at which plants are at their fullest development, which I 

 take it would be when they have a maximum number of flowers exiJanded. 



VOL. IX. [may 1, 1S71.] L 



